5a-4=2a+21

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Solution for 5a-4=2a+21 equation:


Simplifying
5a + -4 = 2a + 21

Reorder the terms:
-4 + 5a = 2a + 21

Reorder the terms:
-4 + 5a = 21 + 2a

Solving
-4 + 5a = 21 + 2a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-2a' to each side of the equation.
-4 + 5a + -2a = 21 + 2a + -2a

Combine like terms: 5a + -2a = 3a
-4 + 3a = 21 + 2a + -2a

Combine like terms: 2a + -2a = 0
-4 + 3a = 21 + 0
-4 + 3a = 21

Add '4' to each side of the equation.
-4 + 4 + 3a = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 3a = 21 + 4
3a = 21 + 4

Combine like terms: 21 + 4 = 25
3a = 25

Divide each side by '3'.
a = 8.333333333

Simplifying
a = 8.333333333

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